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# Generate a butterfly pattern using letters in Python

Vinisha Maheshwari

### Overview

Numerous patterns can be printed in Python once we have a strong grip over loops. Here we’ll use simple for loops to generate a butterfly pattern using letters of the English alphabet.

### Description

To execute a butterfly pattern in Python, we’ll use 2 for loops: one for the upper half and the other for the lower half.

• First loop: It forms the upper two triangles (right and left).
• Second loop: It forms the lower two triangles (right and left).

### Code

Let’s look at the code below.

# Number of rows
r = 5

# Upper Triangles
for i in range(1, r+1):
ch = chr(64+i)
print(ch*i, end="")
print(" "*(r-i)*2, end="")
print(ch*i)

# Lower Triangles
for i in range(r,0,-1):
ch = chr(64+i)
print(ch*i, end="")
print(" "*(r-i)*2, end="")
print(ch*i)


Implementation of butterfly pattern

### Explanation

• Line 2: We take the input for half the number of rows (which is half the length of the wings of the butterfly).

• Lines 5–9: We create a for loop to generate the upper triangles.

• ch is used to create letters from numbers by using the iterative value of i and the concept of ASCII conversion. The starting value 64+(i=1) has been used as ASCII value of A, which is 65.
• The print statement in line 7 generates the leftmost upper triangle.
• The print statement in line 8 generates the spaces in between.
• The print statement in line 9 generates the rightmost upper triangle.
• Lines 12 to 16: We create a for loop to generate the lower triangles.

• ch is used to create alphabets from numbers by using the iterative value of i and the concept of ASCII conversion. The starting value 64+(i=1) has been used as ASCII value of A, which is 65.
• The print statement in line 14 generates the leftmost inverted triangle.
• The print statement in line 15 generates the spaces in between.
• The print statement in line 16 generates the rightmost inverted triangle.

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Vinisha Maheshwari
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